Printable Hard Sudoku

Set 1m9j79a. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
2 7 9 4
1 5
6 4 9 1
2 9 6 5
5 7 1
3 6
5 4 6 9
7 8 6
5 4 3
Hard #2
6 4
3 2 7
3 8 2 6
8 9 1 4
6 2 3
9 5
5 2
7 8 5 2 4 9
2 7 6
Hard #3
2 6 5
3 7 2 8 9
9 2 1
5 1 3 2
8 3 7
5
5 4 1 6
8
6 8 3 2 9
Hard #4
7 6 2 9 4
7 3
3 9 5
3 1 4
3 9
9 8 2 5 1
5 4
9 4 8
6 7 8 5
Hard #5
7 8 9
3 2 4
8 6 9 3
9 8 3
4 7
2 5 6 9
5 3 4 8
5 2
1 7 3 8
Hard #6
2 3 6
4 3 8 5
8 3
6 2
4 9 3 7 6
3 7 8
7 6 9
3 2 9
4 1 8 7
Hard #7
6 2 8 4
7 9 2
8 5
1 3 5
9 1 4
4 8 5 7
6 3 9 7
1 8 3
4 2 6
Hard #8
9 1 3
8 4 5 2
6
3 2
9 3 6 1 5 8 4
6 5 4 9
2 1 8
1 2 7 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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